Well its more than one question,First if I remem ber correctly there are different version and when you turn the machine on it tells you what version is by the way of numbers ,How many versions are there how can you tell how old is the detector .I had one of the first T2 out of the gate and boy it was a hell of a digger,I could pull a wheat penny at 10 + inches no problem!!!Is there a big difference between the regular T2 and the SE other than the boost feature .is it really that much better ??I'm on the market for a used T2 ...Do people really use these detector on the beach ??.